I have been developing feelings for my friend for quite some time, but he still doesn't know about them. How can I let him know without ruining our friendship if he doesn't feel the same way towards me?

Go for it.. the best love comes from friendship. You have nothing to lose at this point and I think that he should know. He might be thinking the same thing as you. Does he have a girlfriend? If he does, then you probably shouldn't. I liked someone for 18 years and still never told him because I was afraid. I always keep thinking about the "what ifs". Please girl do me a favor and tell him.. don't end up like me and shooting yourself in the foot because you never told him. If you are really that good of friends, then you should be friends afterwards also.

I think you should go for it as well, and if he really is a good friend he will continue to be friends with you even if he doesn't feel the same way about you. There is nothing to lose, if he feels the same way you'll win an amazing boyfriend, and if he doesn't you'll stay his friend and with time you'll find another guy that may be even better who will catch your breath and dazzle you whenever he comes by.

This may seem sneaky, but possibly you could get a mutual friend of yours, and his, that he would be willing to confide in, persuade them to possibly joke around about the idea of you and him dating, and see what his reaction is.
But with that approach, there is always the chance that he won't open up and admit his feelings for you.

Just do your best, possibly do some reading up on interpreting the feelings of others and/or body language, it may help you with your predicament.

Goodluck!!

Let him know. It is the risk you take. It might change things or it might not. The fear of losing a friendship but what if you gain even a stronger relationship and more? It is a risk but I do believe that you should take that chanch.

Best wishes. Remember it is your decision on what to do. If it does not work out remember you would never have known unless you asked. Many people are afraid of losing a friendship but I believe the best way to develop into something greater is to start with friendship first anyway.

It did work with me. Good luck.